DR. ROBERT S MASTMAN (M.D.) – Ophthalmology Physician, NPI 1386683191
Ophthalmology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,665 OPHTHALMOLOGY in CA
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Provider Addresses for DR. ROBERT S MASTMAN (M.D.)
10300, South De Anza Boulevard, Cupertino, Santa Clara County, California, 95014-3010, United States
CUPERTINO, CA 950143030
Phone: (408) 253-3083
Fax: (408) 253-2965
Type: Mailing
2577, Samaritan Drive, San Jose, Santa Clara County, California, 95124, United States
SUITE 740
SAN JOSE, CA 951244100
Phone: (408) 358-2029
Fax: (408) 356-5873
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 42 Open Payments records for all available years, with a total value of $922.
Total Amount is formed as General ($922) + Research ($0) + Ownership ($0) = $922.
Last reported payment date: 2024-12-13 • Largest payer in this snapshot: Oyster Point Pharma, Inc. ($201).
Total Amount
$922
General + Research + Ownership
Payments
42
Total payment records
General Amount
$922
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-13
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-08-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20080814000602 | I | Ophthalmology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 776 | 672 | $0 |
| 92012 | Established patient problem focused exam of visual system | 617 | 403 | $0 |
| 92134 | Imaging of retina | 346 | 340 | $0 |
| 92250 | Photography of the retina | 299 | 298 | $0 |
| 92083 | Exam of visual field with extended testing | 275 | 271 | $0 |
Insurance plans in this area (ZIP 95014)
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Provider's Procedures
Group practice members
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Reviews
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